8.0RC2 amd64 - kernel panic running make buildworld

[John Baldwin]

On Wednesday 11 November 2009 2:15:18 pm S.N.Grigoriev wrote:
> 
> 10.11.09, 09:15, "Mark Atkinson" <atkin901 at yahoo.com>
> wrote:
> 
> > Andriy Gapon wrote:
> > > on 10/11/2009 17:22 gary.jennejohn at freenet.de said the following:
> > >> Well, OK, I may have misinterpreted what you wrote or have chosen bad
> > >> wording myself to convey the same message.  Nonetheless it looks like
> > >> a hardware problem to me.
> > > 
> > > [Trying to make up for my previous mistake.]
> > > 
> > > The symptom certainly looks like misbehaving hardware, but other 
information from
> > > the reports seems to suggest that it is possible that this misbehavior 
might be
> > > caused by software misconfiguring the hardware.
> > > 
> > > I would re-test vm.pmap.pg_ps_enabled=0 just to be sure that it was 
correctly teh
> > > first time.
> > > I would try to see how 8.0-RC1 kernel behaves and in general try to find 
last
> > > working, first non-working version.
> > > It would be useful to know any (if any) non-default loader.conf and 
rc.conf
> > > settings or kernel config (if not GENERIC).
> > > 
> > > Not a trivial issue unless it is hardware indeed.
> > > 
> > Also, you can try adding:
> > hw.mca.enabled="1" in /boot/loader.conf, reboot,  and then see if there
> > is a machine check exception on the console during the buildworld.
> 
> Mark,
> 
> I've added hw.mca.enabled="1" in /boot/loader.conf and got the following
> screen during the buildworld:
> 
> .....
>  -c /usr/src/gnu/usr.bin/binutils/as/../../../../contrib/binutils/gas/sb.c
> 
> MCA: CPU3 UNCOR PCC OVER DTLIB L1 error
> MCA: Address 0x8015fb000

You hardware is broken and it is telling you so.  You have had multiple 
machine checks with the most severe one being an uncorrectable error in your 
data TLB (i.e. in the CPU itself).

-- 
John Baldwin